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rparigoris
Joined: 24 Nov 2009
Posts: 805
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 Posted: Fri May 28, 2010 9:21 pm Post subject: Tri State Logic help needed |
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Trying to wire stick grip to control Airmaster electric constant prop manual control (jog to course or fine) we came to realization we are one wire short on connector.
Thus it would save a lot of time and effort if I could use Tri State Logic for a solution.
I could easily have one wire with three states using my SPTT switch on stick.
1) Infinite resistance (not connected to anything) when switch is in neutral
2)+12V when pushing momentary switch forward
3) (-) ground when pushing momentary switch back
My goals:
** Have 2) +12V energize a 5 amp relay which runs prop Course
** Have 3) (-) energize a 5 amp relay which runs prop Fine
** Have 1) NOT energize either Course or Fine relay
Any help and or ideas greatly appreciated.
I think I would rather use relays compared to solid state because I just don't know what is going on inside the constant speed controller, and relay contacts can easily replicate resistance compared to supplied switch.
I am OK with failure mode of circuit and relays because I plan to replicate for each stick (2).
Ron Parigoris
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james(at)etravel.org
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| Posted: Fri May 28, 2010 11:33 pm Post subject: Tri State Logic help needed |
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Ron,
How about using a double pole switch in place of a single pole
version. You can put the 0 and 12V onto the two inputs of the switch,
and wire the outputs together so that they swap them between 0V on one
and 12V on the other, to 12V on one and 0V on the other. Perhaps a
suitable switch exists for this.
A picture would doubtless speak a thousand words, but I have to dash
up the paintshop because the plane's in the middle of being painted.
If it's not clear I'll draw and send later.
HTH.
James
On Sat, May 29, 2010 at 6:21 AM, rparigoris <rparigor(at)suffolk.lib.ny.us> wrote:
| Quote: |
Trying to wire stick grip to control Airmaster electric constant prop manual control (jog to course or fine) we came to realization we are one wire short on connector.
Thus it would save a lot of time and effort if I could use Tri State Logic for a solution.
I could easily have one wire with three states using my SPTT switch on stick.
1) Infinite resistance (not connected to anything) when switch is in neutral
2)+12V when pushing momentary switch forward
3) (-) ground when pushing momentary switch back
My goals:
** Have 2) +12V energize a 5 amp relay which runs prop Course
** Have 3) (-) energize a 5 amp relay which runs prop Fine
** Have 1) NOT energize either Course or Fine relay
Any help and or ideas greatly appreciated.
I think I would rather use relays compared to solid state because I just don't know what is going on inside the constant speed controller, and relay contacts can easily replicate resistance compared to supplied switch.
I am OK with failure mode of circuit and relays because I plan to replicate for each stick (2).
Ron Parigoris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=299239#299239
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rparigoris
Joined: 24 Nov 2009
Posts: 805
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| Posted: Sat May 29, 2010 12:02 am Post subject: Re: Tri State Logic help needed |
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Hi James
Thx. for the reply.
We are using a Ray Allen G-205 stick grips (2). There ain't much room in there. We are using an ultra miniature single pole triple throw switch as sold by them to bearly fit in the aux position. There is no room for a triple throw double pole switch. We have a 9 pin connector that lives in the stick itself, all the pins are used up.
Currently we are using two 5 twisted wires. If we added another separate wire which would then be two 5 twisted and a single wire, decided to take apart stick grip and rewire and search for an 11 pin connector that would fit in stick we could make do with the single pole triple throw switch.
Stick grips are wired, connectors and wires are complete:
http://www.europaowners.org/forums/gallery2.php?g2_itemId=31677
Wayne made assumption that we could use ship +12v and (-) which he did on schematic. Kinda found out tonight we shot ourselves in foot as you really need to use +12v and (-) that is located on Airmaster controller.
Anyway leaving alone stick grip, wiring of stick grip, stick grip connectors and two already made 5 wire harnesses (times two, Pilot and Co-Pilot) if we could leave existing alone anduse tri state logic to redeem ourselves, would be a big time and effort saver.
Ron Parigoris
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rparigoris
Joined: 24 Nov 2009
Posts: 805
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Bob McC
Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON
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| Posted: Sat May 29, 2010 6:36 am Post subject: Tri State Logic help needed |
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Ron;
Attached is a circuit which is not particularly elegant will function as you've requested. I'm not certain that the possible failure modes are acceptable, or that you'd be happy with the relays constantly energized which is the way this circuit operates, but for what it's worth here it is. Sketch is shown with power disconnected, relays in relaxed (off) position. This circuit will connect the fine and coarse wires to each other during normal flight operation. If this is not acceptable then a diode could be introduced in each of these wires to isolate them from each other.
<![if !supportLists]>· <![endif]>With the stick switch in centre – no connection – (Situation 1) both relays are energized and no power can flow to either coarse or fine output wire.
<![if !supportLists]>· <![endif]>With stick switch supplying +12V – (Situation 2) - Upper relay has +12 on both ends of coil, therefore turns off and lower relay supplies +12V to “coarse” wire.
<![if !supportLists]>· <![endif]>With stick switch supplying ground – (situation 3) - Lower relay has both sides of coil grounded therefore turns off and upper relay supplies +12V to “fine” wire.
Resistors should be approximately the same resistance and wattage as the relay coils. You require a resistor in the lead from each stick switch so that in a situation where one stick is selecting coarse and the other fine, the resistors dissipate the energy which would otherwise be a dead short through the grip switches. In this scenario, theoretically the relay common point would remain at 6 Volts and no pitch change would happen. You could also incorporate a panel switch into this circuit, wired the same way. Note also the relays have 6 Volt coils.
Bob McC
> -----Original Message-----
> From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-
> server(at)matronics.com] On Behalf Of rparigoris
> Sent: Saturday, May 29, 2010 1:22 AM
> To: aeroelectric-list(at)matronics.com
> Subject: Tri State Logic help needed
>
> --> AeroElectric-List message posted by: "rparigoris" <rparigor(at)suffolk.lib.ny.us>
>
> Trying to wire stick grip to control Airmaster electric constant prop manual control
> (jog to course or fine) we came to realization we are one wire short on connector.
>
> Thus it would save a lot of time and effort if I could use Tri State Logic for a solution.
>
> I could easily have one wire with three states using my SPTT switch on stick.
> 1) Infinite resistance (not connected to anything) when switch is in neutral
> 2)+12V when pushing momentary switch forward
> 3) (-) ground when pushing momentary switch back
>
> My goals:
> ** Have 2) +12V energize a 5 amp relay which runs prop Course
> ** Have 3) (-) energize a 5 amp relay which runs prop Fine
> ** Have 1) NOT energize either Course or Fine relay
>
> Any help and or ideas greatly appreciated.
>
> I think I would rather use relays compared to solid state because I just don't know
> what is going on inside the constant speed controller, and relay contacts can easily
> replicate resistance compared to supplied switch.
>
> I am OK with failure mode of circuit and relays because I plan to replicate for each
> stick (2).
>
> Ron Parigoris
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=299239#299239
>
>
>
>
>
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_________________
Bob McC
Falco #908
(just starting) |
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